2011年全国股份制商业银行行长联席会议9月15日在重庆举行。重庆市市长黄奇帆在

以下两题的关系代数操作是基于如下的关系R和S。

若结果如下，这是对关系R和S执行了（）。

A．

B．

C． 

D．

第29届北京奥运会火炬接力的传递行程约为137 000 000米，用科学记数法表示约为______米．

短文改错 。

     假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中

共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

     删除：把多余的词用斜线（\）划掉。

     修改：在错的词下面划一横线，并在该词下面写出修改后的词。

     注意：

     1. 每处错误及其修改均仅限一词；

      2. 只允许修改10处，多者（从第11处起）不计分。

I just come back from Britain last week. I was luckily enough to be 

one of the students from different countries to visit the UK from Feb.16 to

28. We paid a visit to many places of interests, like London, Oxford or 

the Lake District. I learned much about British culture and history in

London, where was my favorite. I also liked Oxford, in which I saw much

more old buildings . The Lake District was beautiful, but it was pity

that it  rained heavily  when they were there. The most excited thing 

for me in the Britain was that I made a lot of friends there.

_____________________________________________________________________________

Keeping a foreign pet is dangerous, as the owner might be infected ________ the diseases brought along with the animal.

A．in

B．with

C．by

D．for

1992年，标志着我国证券市场国际化进程开始的是( )的上市。

A．可转换债券

B．优先股

C．人民币特种股票

D．转配股